diff --git a/spec/models/location_deactivation_period_spec.rb b/spec/models/location_deactivation_period_spec.rb
index 6157b893b..da3dfcfdf 100644
--- a/spec/models/location_deactivation_period_spec.rb
+++ b/spec/models/location_deactivation_period_spec.rb
@@ -85,5 +85,77 @@ RSpec.describe LocationDeactivationPeriod do
         end
       end
     end
+
+    context "when there is an open deactivation period less than six months in the future" do # validate_reactivation
+      let!(:location) { FactoryBot.build(:location, created_at: previous_collection_start_date - 2.years) }
+      let!(:existing_period) { FactoryBot.create(:location_deactivation_period, deactivation_date: Time.zone.now + 5.months, location:) }
+
+      context "when reactivation date is nil" do
+        let(:record) { FactoryBot.build(:location_deactivation_period, deactivation_date: Time.zone.now, location:) }
+
+        it "adds an error" do
+          validator.validate(record)
+          expect(record.errors.count).to eq(1)
+          expect(record.errors[:reactivation_date_type]).to include("Select one of the options.")
+        end
+      end
+
+      context "when reactivation date is present" do
+        context "when reactivation date is before the existing period's start" do
+          let(:record) { FactoryBot.build(:location_deactivation_period, deactivation_date: Time.zone.now + 3.months, reactivation_date: Time.zone.now + 4.months, location:) }
+
+          it "adds an error" do
+            validator.validate(record)
+            expect(record.errors[:reactivation_date].count).to eq(1)
+            expect(record.errors[:reactivation_date][0]).to match("The reactivation date must be on or after deactivation date.")
+          end
+        end
+
+        context "when reactivation date is after the existing period's start" do
+          let(:record) { FactoryBot.build(:location_deactivation_period, deactivation_date: Time.zone.now + 3.months, reactivation_date: Time.zone.now + 6.months, location:) }
+
+          it "does not add an error" do
+            validator.validate(record)
+            expect(record.errors).to be_empty
+          end
+        end
+      end
+    end
+
+    context "when there is not an open deactivation period within six months" do # validate_deactivation
+      let!(:location) { FactoryBot.create(:location, created_at: previous_collection_start_date - 2.years) }
+      let!(:existing_period_1) { FactoryBot.create(:location_deactivation_period, deactivation_date: Time.zone.now + 7.months, reactivation_date: Time.zone.now + 8.months, location:) }
+      let!(:existing_period_2) { FactoryBot.create(:location_deactivation_period, deactivation_date: Time.zone.now + 1.month, reactivation_date: Time.zone.now + 2.months, location:) }
+      let!(:existing_period_3) { FactoryBot.create(:location_deactivation_period, deactivation_date: Time.zone.now + 9.months, location:) }
+
+      context "when reactivation date is nil" do
+        let(:record) { FactoryBot.build(:location_deactivation_period, deactivation_date: Time.zone.now, location:) }
+
+        it "does not add an error" do
+          validator.validate(record)
+          expect(record.errors).to be_empty
+        end
+      end
+
+      context "when reactivation date is present" do
+        context "when deactivation date is less than six months in the future" do
+          let(:record) { FactoryBot.build(:location_deactivation_period, deactivation_date: Time.zone.now + 3.months, reactivation_date: Time.zone.now + 4.months, location:) }
+
+          it "does not add an error" do
+            validator.validate(record)
+            expect(record.errors).to be_empty
+          end
+        end
+
+        context "when deactivation date is more than six months in the future" do
+          let(:record) { FactoryBot.build(:location_deactivation_period, deactivation_date: Time.zone.now + 9.months, reactivation_date: Time.zone.now + 10.months, location:) }
+
+          it "does not add an error" do
+            validator.validate(record)
+            expect(record.errors).to be_empty
+          end
+        end
+      end
+    end
   end
 end
diff --git a/spec/models/location_spec.rb b/spec/models/location_spec.rb
index 6d876381d..a98487d86 100644
--- a/spec/models/location_spec.rb
+++ b/spec/models/location_spec.rb
@@ -1082,6 +1082,16 @@ RSpec.describe Location, type: :model do
       it "returns active if the location has no relevant deactivation records" do
         expect(location.status_at(Time.zone.today - 2.months)).to eq(:active)
       end
+
+      context "when the most recently created deactivation is not the current one" do
+        before do
+          FactoryBot.create(:location_deactivation_period, deactivation_date: Time.zone.today - 80.days, reactivation_date: Time.zone.today - 70.days, location:)
+        end
+
+        it "returns reactivating_soon" do
+          expect(location.status_at(Time.zone.today - 3.days)).to eq(:reactivating_soon)
+        end
+      end
     end
   end
 
diff --git a/spec/models/scheme_deactivation_period_spec.rb b/spec/models/scheme_deactivation_period_spec.rb
index 5d4e6f6e2..bf15d7dd3 100644
--- a/spec/models/scheme_deactivation_period_spec.rb
+++ b/spec/models/scheme_deactivation_period_spec.rb
@@ -4,8 +4,6 @@ RSpec.describe SchemeDeactivationPeriod do
   let(:validator) { SchemeDeactivationPeriodValidator.new }
   let(:previous_collection_start_date) { Time.zone.local(2022, 4, 1) }
   let(:current_collection_start_date) { Time.zone.local(2023, 4, 1) }
-  let(:scheme) { FactoryBot.create(:scheme, created_at: previous_collection_start_date - 2.years) }
-  let(:record) { FactoryBot.create(:scheme_deactivation_period, deactivation_date: current_collection_start_date, scheme:) }
 
   describe "#validate" do
     before do
@@ -14,58 +12,136 @@ RSpec.describe SchemeDeactivationPeriod do
     end
 
     context "when not in a crossover period" do
-      before do
-        allow(FormHandler.instance).to receive(:in_edit_crossover_period?).and_return(false)
-      end
+        let(:scheme) { FactoryBot.create(:scheme, created_at: previous_collection_start_date - 2.years) }
+        let(:record) { FactoryBot.create(:scheme_deactivation_period, deactivation_date: current_collection_start_date, scheme:) }
+
+        before do
+          allow(FormHandler.instance).to receive(:in_edit_crossover_period?).and_return(false)
+        end
+
+        context "with a deactivation date before the current collection period" do
+          it "adds an error" do
+            record.deactivation_date = current_collection_start_date - 1.year
+            scheme.scheme_deactivation_periods.clear
+            validator.validate(record)
+            expect(record.errors[:deactivation_date]).to include("The date must be on or after the 1 April 2023.")
+          end
+        end
+
+        context "with a deactivation date in the current collection period" do
+          it "does not add an error" do
+            record.deactivation_date = current_collection_start_date + 1.day
+            scheme.scheme_deactivation_periods.clear
+            validator.validate(record)
+            expect(record.errors[:deactivation_date]).to be_empty
+          end
+        end
+    end
+
+    context "when in a crossover period" do
+        let(:scheme) { FactoryBot.create(:scheme, created_at: previous_collection_start_date - 2.years) }
+        let(:record) { FactoryBot.create(:scheme_deactivation_period, deactivation_date: current_collection_start_date, scheme:) }
+
+        before do
+          allow(FormHandler.instance).to receive(:in_edit_crossover_period?).and_return(true)
+        end
+
+        context "with a deactivation date before the previous collection period" do
+          it "does not add an error" do
+            record.deactivation_date = previous_collection_start_date - 2.years
+            scheme.scheme_deactivation_periods.clear
+            validator.validate(record)
+            expect(record.errors[:deactivation_date]).to include("The date must be on or after the 1 April 2022.")
+          end
+        end
+
+        context "with a deactivation date in the previous collection period" do
+          it "does not add an error" do
+            record.deactivation_date = previous_collection_start_date + 1.year
+            scheme.scheme_deactivation_periods.clear
+            validator.validate(record)
+            expect(record.errors[:deactivation_date]).to be_empty
+          end
+        end
+
+        context "with a deactivation date in the current collection period" do
+          it "does not add an error" do
+            record.deactivation_date = current_collection_start_date + 1.day
+            scheme.scheme_deactivation_periods.clear
+            validator.validate(record)
+            expect(record.errors[:deactivation_date]).to be_empty
+          end
+        end
+    end
+
+    context "when there is an open deactivation period less than six months in the future" do # validate_reactivation
+      let!(:scheme) { FactoryBot.build(:scheme, created_at: previous_collection_start_date - 2.years) }
+      let!(:existing_period) { FactoryBot.create(:scheme_deactivation_period, deactivation_date: Time.zone.now + 5.months, scheme:) }
+
+      context "when reactivation date is nil" do
+        let(:record) { FactoryBot.build(:scheme_deactivation_period, deactivation_date: Time.zone.now, scheme:) }
 
-      context "with a deactivation date before the current collection period" do
         it "adds an error" do
-          record.deactivation_date = current_collection_start_date - 1.year
-          scheme.scheme_deactivation_periods.clear
           validator.validate(record)
-          expect(record.errors[:deactivation_date]).to include("The date must be on or after the 1 April 2023.")
+          expect(record.errors.count).to eq(1)
+          expect(record.errors[:reactivation_date_type]).to include("Select one of the options.")
         end
       end
 
-      context "with a deactivation date in the current collection period" do
-        it "does not add an error" do
-          record.deactivation_date = current_collection_start_date + 1.day
-          scheme.scheme_deactivation_periods.clear
-          validator.validate(record)
-          expect(record.errors[:deactivation_date]).to be_empty
+      context "when reactivation date is present" do
+        context "when reactivation date is before the existing period's start" do
+          let(:record) { FactoryBot.build(:scheme_deactivation_period, deactivation_date: Time.zone.now + 3.months, reactivation_date: Time.zone.now + 4.months, scheme:) }
+
+          it "adds an error" do
+            validator.validate(record)
+            expect(record.errors[:reactivation_date].count).to eq(1)
+            expect(record.errors[:reactivation_date][0]).to match("The reactivation date must be on or after deactivation date.")
+          end
+        end
+
+        context "when reactivation date is after the existing period's start" do
+          let(:record) { FactoryBot.build(:scheme_deactivation_period, deactivation_date: Time.zone.now + 3.months, reactivation_date: Time.zone.now + 6.months, scheme:) }
+
+          it "does not add an error" do
+            validator.validate(record)
+            expect(record.errors).to be_empty
+          end
         end
       end
     end
 
-    context "when in a crossover period" do
-      before do
-        allow(FormHandler.instance).to receive(:in_edit_crossover_period?).and_return(true)
-      end
+    context "when there is not an open deactivation period within six months" do # validate_deactivation
+      let!(:scheme) { FactoryBot.create(:scheme, created_at: previous_collection_start_date - 2.years) }
+      let!(:existing_period_1) { FactoryBot.create(:scheme_deactivation_period, deactivation_date: Time.zone.now + 7.months, reactivation_date: Time.zone.now + 8.months, scheme:) }
+      let!(:existing_period_2) { FactoryBot.create(:scheme_deactivation_period, deactivation_date: Time.zone.now + 1.month, reactivation_date: Time.zone.now + 2.months, scheme:) }
+      let!(:existing_period_3) { FactoryBot.create(:scheme_deactivation_period, deactivation_date: Time.zone.now + 9.months, scheme:) }
+
+      context "when reactivation date is nil" do
+        let(:record) { FactoryBot.build(:scheme_deactivation_period, deactivation_date: Time.zone.now, scheme:) }
 
-      context "with a deactivation date before the previous collection period" do
         it "does not add an error" do
-          record.deactivation_date = previous_collection_start_date - 2.years
-          scheme.scheme_deactivation_periods.clear
           validator.validate(record)
-          expect(record.errors[:deactivation_date]).to include("The date must be on or after the 1 April 2022.")
+          expect(record.errors).to be_empty
         end
       end
 
-      context "with a deactivation date in the previous collection period" do
-        it "does not add an error" do
-          record.deactivation_date = previous_collection_start_date + 1.year
-          scheme.scheme_deactivation_periods.clear
-          validator.validate(record)
-          expect(record.errors[:deactivation_date]).to be_empty
+      context "when reactivation date is present" do
+        context "when deactivation date is less than six months in the future" do
+          let(:record) { FactoryBot.build(:scheme_deactivation_period, deactivation_date: Time.zone.now + 3.months, reactivation_date: Time.zone.now + 4.months, scheme:) }
+
+          it "does not add an error" do
+            validator.validate(record)
+            expect(record.errors).to be_empty
+          end
         end
-      end
 
-      context "with a deactivation date in the current collection period" do
-        it "does not add an error" do
-          record.deactivation_date = current_collection_start_date + 1.day
-          scheme.scheme_deactivation_periods.clear
-          validator.validate(record)
-          expect(record.errors[:deactivation_date]).to be_empty
+        context "when deactivation date is more than six months in the future" do
+          let(:record) { FactoryBot.build(:scheme_deactivation_period, deactivation_date: Time.zone.now + 9.months, reactivation_date: Time.zone.now + 10.months, scheme:) }
+
+          it "does not add an error" do
+            validator.validate(record)
+            expect(record.errors).to be_empty
+          end
         end
       end
     end
diff --git a/spec/models/scheme_spec.rb b/spec/models/scheme_spec.rb
index a0afad6fa..72c7595a5 100644
--- a/spec/models/scheme_spec.rb
+++ b/spec/models/scheme_spec.rb
@@ -470,6 +470,16 @@ RSpec.describe Scheme, type: :model do
       it "returns active if the scheme has no relevant deactivation records" do
         expect(scheme.status_at(Time.zone.today - 1.month)).to eq(:active)
       end
+
+      context "when the most recently created deactivation is not the current one" do
+        before do
+          FactoryBot.create(:scheme_deactivation_period, deactivation_date: Time.zone.today - 300.days, reactivation_date: Time.zone.today - 200.days, scheme:)
+        end
+
+        it "returns reactivating_soon" do
+          expect(scheme.status_at(Time.zone.today - 3.days)).to eq(:reactivating_soon)
+        end
+      end
     end
   end
 
diff --git a/spec/models/validations/setup_validations_spec.rb b/spec/models/validations/setup_validations_spec.rb
index 1104cc23d..50b1665ef 100644
--- a/spec/models/validations/setup_validations_spec.rb
+++ b/spec/models/validations/setup_validations_spec.rb
@@ -512,6 +512,47 @@ RSpec.describe Validations::SetupValidations do
       end
     end
 
+    context "with a scheme whose chronologically latest deactivation period is not most recently created" do
+      let(:scheme) { create(:scheme) }
+
+      before do
+        create(:location, scheme:)
+        scheme_deactivation_period = build(:scheme_deactivation_period, deactivation_date: Time.zone.local(2022, 6, 2), reactivation_date: Time.zone.local(2022, 8, 3), scheme:)
+        scheme_deactivation_period_2 = build(:scheme_deactivation_period, deactivation_date: Time.zone.local(2022, 2, 4), reactivation_date: Time.zone.local(2022, 3, 4), scheme:)
+        scheme_deactivation_period.save!(validate: false)
+        scheme_deactivation_period_2.save!(validate: false)
+        scheme.reload
+      end
+
+      it "produces error when tenancy start date is during later deactivated scheme period" do
+        record.startdate = Time.zone.local(2022, 7, 5)
+        record.scheme = scheme
+        setup_validator.validate_scheme(record)
+        expect(record.errors["startdate"])
+          .to include(match I18n.t("validations.lettings.setup.startdate.scheme.reactivating_soon.startdate", name: scheme.service_name, date: "4 August 2022"))
+        expect(record.errors["scheme_id"])
+          .to include(match I18n.t("validations.lettings.setup.startdate.scheme.reactivating_soon.scheme_id", name: scheme.service_name, date: "4 August 2022"))
+      end
+
+      it "produces error when tenancy start date is during earlier deactivated scheme period" do
+        record.startdate = Time.zone.local(2022, 2, 5)
+        record.scheme = scheme
+        setup_validator.validate_scheme(record)
+        expect(record.errors["startdate"])
+          .to include(match I18n.t("validations.lettings.setup.startdate.scheme.reactivating_soon.startdate", name: scheme.service_name, date: "4 August 2022"))
+        expect(record.errors["scheme_id"])
+          .to include(match I18n.t("validations.lettings.setup.startdate.scheme.reactivating_soon.scheme_id", name: scheme.service_name, date: "4 August 2022"))
+      end
+
+      it "produces no error when tenancy start date is during an active scheme period" do
+        record.startdate = Time.zone.local(2022, 10, 1)
+        record.scheme = scheme
+        setup_validator.validate_scheme(record)
+        expect(record.errors["startdate"]).to be_empty
+        expect(record.errors["scheme_id"]).to be_empty
+      end
+    end
+
     context "with a scheme with no locations active on the start date & no location set" do
       let(:scheme) { create(:scheme) }
       let(:location) { create(:location, scheme:) }
diff --git a/spec/requests/locations_controller_spec.rb b/spec/requests/locations_controller_spec.rb
index e8024bf76..cf8959510 100644
--- a/spec/requests/locations_controller_spec.rb
+++ b/spec/requests/locations_controller_spec.rb
@@ -2169,6 +2169,29 @@ RSpec.describe LocationsController, type: :request do
           expect(page).to have_content(I18n.t("validations.location.reactivation.before_deactivation", date: "10 October 2022"))
         end
       end
+
+      context "when there is no open deactivation period" do
+        let(:params) { { location_deactivation_period: { reactivation_date_type: "other", "reactivation_date": "8/9/2022" } } }
+
+        before do
+          location.location_deactivation_periods.clear
+          create(:location_deactivation_period, deactivation_date: Time.zone.local(2022, 5, 1), reactivation_date: Time.zone.local(2022, 7, 5), updated_at: Time.zone.local(2000, 1, 1), location:)
+          create(:location_deactivation_period, deactivation_date: Time.zone.local(2023, 1, 1), reactivation_date: Time.zone.local(2023, 4, 5), updated_at: Time.zone.local(2000, 1, 1), location:)
+          location.save!
+          patch "/schemes/#{scheme.id}/locations/#{location.id}/reactivate", params:
+        end
+
+        it "renders not found" do
+          expect(response).to have_http_status(:not_found)
+        end
+
+        it "does not update deactivation periods" do
+          location.reload
+          expect(location.location_deactivation_periods.count).to eq(2)
+          expect(location.location_deactivation_periods[0].updated_at).to eq(Time.zone.local(2000, 1, 1))
+          expect(location.location_deactivation_periods[1].updated_at).to eq(Time.zone.local(2000, 1, 1))
+        end
+      end
     end
   end
 
diff --git a/spec/requests/schemes_controller_spec.rb b/spec/requests/schemes_controller_spec.rb
index e5a96992f..080185533 100644
--- a/spec/requests/schemes_controller_spec.rb
+++ b/spec/requests/schemes_controller_spec.rb
@@ -2850,15 +2850,13 @@ RSpec.describe SchemesController, type: :request do
           end
         end
 
-        context "and there already is a deactivation period" do
-          let(:add_deactivations) { create(:scheme_deactivation_period, deactivation_date: Time.zone.local(2023, 6, 5), reactivation_date: nil, scheme:) }
-
+        context "and there already is an open deactivation period" do
           before do
             create(:scheme_deactivation_period, deactivation_date: Time.zone.local(2023, 6, 5), reactivation_date: nil, scheme:)
             patch "/schemes/#{scheme.id}/deactivate", params:
           end
 
-          it "updates existing scheme with valid deactivation date and renders scheme page" do
+          it "updates existing period with valid deactivation date and renders scheme page" do
             follow_redirect!
             follow_redirect!
             expect(response).to have_http_status(:ok)
@@ -2868,10 +2866,37 @@ RSpec.describe SchemesController, type: :request do
             expect(scheme.scheme_deactivation_periods.first.deactivation_date).to eq(deactivation_date)
           end
 
-          it "clears the scheme and scheme answers" do
+          it "clears the scheme answer" do
             expect(lettings_log.scheme).to eq(scheme)
             lettings_log.reload
             expect(lettings_log.scheme).to eq(nil)
+          end
+
+          it "marks log as needing attention" do
+            expect(lettings_log.unresolved).to eq(nil)
+            lettings_log.reload
+            expect(lettings_log.unresolved).to eq(true)
+          end
+        end
+
+        context "and there already is a closed deactivation period" do
+          before do
+            create(:scheme_deactivation_period, deactivation_date: Time.zone.local(2023, 6, 5), reactivation_date: Time.zone.local(2023, 5, 5), scheme:)
+            patch "/schemes/#{scheme.id}/deactivate", params:
+          end
+
+          it "creates new deactivation period with valid deactivation date and renders scheme page" do
+            follow_redirect!
+            follow_redirect!
+            expect(response).to have_http_status(:ok)
+            scheme.reload
+            expect(scheme.scheme_deactivation_periods.count).to eq(2)
+            expect(scheme.scheme_deactivation_periods.map(&:deactivation_date)).to include(deactivation_date)
+          end
+
+          it "clears the scheme answer" do
+            expect(lettings_log.scheme).to eq(scheme)
+            lettings_log.reload
             expect(lettings_log.scheme).to eq(nil)
           end
 
@@ -2967,7 +2992,7 @@ RSpec.describe SchemesController, type: :request do
       end
 
       context "when there is a later open deactivation" do
-        let(:deactivation_date) { Time.zone.local(2022, 10, 10) }
+        # let(:deactivation_date) { Time.zone.local(2022, 10, 10) }
         let(:params) { { scheme_deactivation_period: { deactivation_date_type: "other", "deactivation_date": "8/9/2022" } } }
         let(:add_deactivations) { create(:scheme_deactivation_period, deactivation_date: Time.zone.local(2023, 6, 5), reactivation_date: nil, scheme:) }
 
@@ -2980,6 +3005,216 @@ RSpec.describe SchemesController, type: :request do
     end
   end
 
+  describe "#reactivate" do
+    context "when not signed in" do
+      it "redirects to the sign in page" do
+        patch "/schemes/1/reactivate"
+        expect(response).to redirect_to("/account/sign-in")
+      end
+    end
+
+    context "when signed in as a data provider" do
+      let(:user) { create(:user) }
+      let(:scheme) { create(:scheme, owning_organisation: user.organisation) }
+
+      before do
+        sign_in user
+        patch "/schemes/#{scheme.id}/reactivate"
+      end
+
+      it "returns 401 unauthorized" do
+        expect(response).to be_unauthorized
+      end
+    end
+
+    context "when signed in as a data coordinator" do
+      let(:user) { create(:user, :data_coordinator) }
+      let!(:scheme) { create(:scheme, owning_organisation: user.organisation, created_at: Time.zone.local(2023, 10, 11)) }
+      let(:deactivation_date) { Time.utc(2022, 10, 10) }
+      let(:startdate) { Time.utc(2022, 10, 11) }
+      let(:params) { { scheme_deactivation_period: { reactivation_date: "5/8/2023", reactivation_date_type: "other" } } }
+
+      let(:add_deactivations) {}
+
+      before do
+        allow(FormHandler.instance).to receive(:lettings_in_crossover_period?).and_return(true)
+        Timecop.freeze(Time.utc(2023, 10, 10))
+        # Singleton.__init__(FormHandler)
+        sign_in user
+        add_deactivations
+        scheme.save!
+        get "/schemes/#{scheme.id}/new-reactivation"
+      end
+
+      after do
+        Timecop.unfreeze
+        # Singleton.__init__(FormHandler)
+      end
+
+      context "when there is no open deactivation period" do
+        let(:add_deactivations) do
+          create(:scheme_deactivation_period, deactivation_date: Time.zone.local(2023, 4, 1), reactivation_date: Time.zone.local(2023, 5, 5), updated_at: Time.zone.local(2000, 1, 1), scheme:)
+          create(:scheme_deactivation_period, deactivation_date: Time.zone.local(2024, 1, 1), reactivation_date: Time.zone.local(2026, 4, 5), updated_at: Time.zone.local(2000, 1, 1), scheme:)
+        end
+
+        it "renders not found" do
+          expect(response).to have_http_status(:not_found)
+        end
+
+        it "does not update deactivation periods" do
+          scheme.reload
+          expect(scheme.scheme_deactivation_periods.count).to eq(2)
+          expect(scheme.scheme_deactivation_periods[0].updated_at).to eq(Time.zone.local(2000, 1, 1))
+          expect(scheme.scheme_deactivation_periods[1].updated_at).to eq(Time.zone.local(2000, 1, 1))
+        end
+      end
+
+      context "when there is an open deactivation period starting after reactivation date" do
+        let(:add_deactivations) { create(:scheme_deactivation_period, deactivation_date: Time.zone.local(2023, 9, 15), reactivation_date: nil, updated_at: Time.zone.local(2000, 1, 1), scheme:) }
+
+        before do
+          patch "/schemes/#{scheme.id}/reactivate", params:
+        end
+
+        it "shows an unprocessable content error" do
+          expect(response).to have_http_status(:unprocessable_content)
+          expect(page).to have_content(I18n.t("validations.scheme.reactivation.before_deactivation", date: "15 September 2023"))
+        end
+
+        it "does not update the deactivation period" do
+          scheme.reload
+          expect(scheme.scheme_deactivation_periods.count).to eq(1)
+          expect(scheme.scheme_deactivation_periods[0].updated_at).to eq(Time.zone.local(2000, 1, 1))
+        end
+      end
+
+      context "when there is an open deactivation period starting before reactivation date" do
+        let(:add_deactivations) { create(:scheme_deactivation_period, deactivation_date: Time.zone.local(2023, 7, 15), reactivation_date: nil, scheme:) }
+
+        before do
+          patch "/schemes/#{scheme.id}/reactivate", params:
+        end
+
+        it "redirects to scheme page" do
+          follow_redirect!
+          follow_redirect!
+          expect(response).to have_http_status(:ok)
+          expect(path).to match("/schemes/#{scheme.id}")
+        end
+
+        it "ends the existing deactivation period" do
+          scheme.reload
+          expect(scheme.scheme_deactivation_periods.count).to eq(1)
+          expect(scheme.scheme_deactivation_periods.first.deactivation_date).to eq(Time.zone.local(2023, 7, 15))
+          expect(scheme.scheme_deactivation_periods.first.reactivation_date).to eq(Time.zone.local(2023, 8, 5))
+        end
+
+        context "with default date" do
+          let(:add_deactivations) {}
+          let(:params) { { scheme_deactivation_period: { reactivation_date_type: "default" } } }
+
+          before do
+            allow(FormHandler.instance).to receive(:current_collection_start_year).and_return(2023)
+            create(:scheme_deactivation_period, deactivation_date: Time.zone.local(2023, 9, 15), reactivation_date: nil, scheme:)
+            allow(FormHandler.instance).to receive(:current_collection_start_year).and_return(2024)
+            patch "/schemes/#{scheme.id}/reactivate", params:
+          end
+
+          it "redirects to the scheme details page" do
+            expect(response).to redirect_to("/schemes/#{scheme.id}/details")
+            follow_redirect!
+            follow_redirect!
+            expect(response).to have_http_status(:ok)
+          end
+
+          it "updates existing scheme deactivations with valid reactivation date" do
+            follow_redirect!
+            scheme.reload
+            expect(scheme.scheme_deactivation_periods.count).to eq(1)
+            expect(scheme.scheme_deactivation_periods.first.reactivation_date).to eq(Time.zone.local(2024, 4, 1))
+          end
+        end
+
+        context "with other date" do
+          let(:params) { { scheme_deactivation_period: { reactivation_date_type: "other", "reactivation_date": "10/9/2023" } } }
+
+          it "redirects to the scheme details page" do
+            expect(response).to redirect_to("/schemes/#{scheme.id}/details")
+          end
+
+          it "updates existing scheme deactivations with valid reactivation date" do
+            follow_redirect!
+            scheme.reload
+            expect(scheme.scheme_deactivation_periods.count).to eq(1)
+            expect(scheme.scheme_deactivation_periods.first.reactivation_date).to eq(Time.zone.local(2023, 9, 10))
+          end
+        end
+
+        context "with other future date" do
+          let(:params) { { scheme_deactivation_period: { reactivation_date_type: "other", "reactivation_date": "14/12/2099" } } }
+
+          it "redirects to the scheme details page" do
+            expect(response).to redirect_to("/schemes/#{scheme.id}/details")
+          end
+        end
+
+        context "when the date is not selected" do
+          let(:params) { { scheme_deactivation_period: { "reactivation_date": "" } } }
+
+          it "displays the new page with an error message" do
+            expect(response).to have_http_status(:unprocessable_content)
+            expect(page).to have_content(I18n.t("validations.scheme.toggle_date.not_selected"))
+          end
+        end
+
+        context "when invalid date is entered" do
+          let(:params) { { scheme_deactivation_period: { reactivation_date_type: "other", "reactivation_date": "10/44/2022" } } }
+
+          it "displays the new page with an error message" do
+            expect(response).to have_http_status(:unprocessable_content)
+            expect(page).to have_content(I18n.t("validations.scheme.toggle_date.invalid"))
+          end
+        end
+
+        context "when the date is entered is before the beginning of current collection window" do
+          let(:params) { { scheme_deactivation_period: { reactivation_date_type: "other", "reactivation_date": "10/4/2020" } } }
+
+          it "displays the new page with an error message" do
+            expect(response).to have_http_status(:unprocessable_content)
+            expect(page).to have_content(I18n.t("validations.scheme.toggle_date.out_of_range", date: "1 April 2022"))
+          end
+        end
+
+        context "when the day is not entered" do
+          let(:params) { { scheme_deactivation_period: { reactivation_date_type: "other", "reactivation_date": "/2/2022" } } }
+
+          it "displays page with an error message" do
+            expect(response).to have_http_status(:unprocessable_content)
+            expect(page).to have_content(I18n.t("validations.scheme.toggle_date.invalid"))
+          end
+        end
+
+        context "when the month is not entered" do
+          let(:params) { { scheme_deactivation_period: { reactivation_date_type: "other", "reactivation_date": "2//2022" } } }
+
+          it "displays page with an error message" do
+            expect(response).to have_http_status(:unprocessable_content)
+            expect(page).to have_content(I18n.t("validations.scheme.toggle_date.invalid"))
+          end
+        end
+
+        context "when the year is not entered" do
+          let(:params) { { scheme_deactivation_period: { reactivation_date_type: "other", "reactivation_date": "2/2/" } } }
+
+          it "displays page with an error message" do
+            expect(response).to have_http_status(:unprocessable_content)
+            expect(page).to have_content(I18n.t("validations.scheme.toggle_date.invalid"))
+          end
+        end
+      end
+    end
+  end
+
   describe "#delete-confirmation" do
     let(:scheme) { create(:scheme, owning_organisation: user.organisation) }